Finished Glog by caritolopezchavez

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Human Anatomy

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Finished Glog by caritolopezchavez

The nervous system has three main types of neurons: Sensory, Motor, & Interneurons. Sensory neurons are neurons that are activated by sensory input (vision, touch, hearing) and send projections into the central nervous system that convey sensory information to the brain or spinal cord. A motor neuron is a type of cell in the nervous system that directly or indirectly controls the contraction or relaxation of muscles, which in most cases leads to movement. Motor neurons are also called motoneurons or efferent neurons. An interneuron, also known as an associated neuron, is a neuron located entirely within the central nervous system that conducts signals between neurons. An interneuron is a multipolar neuron, or a neuron with more than one dendrite. Dendrites usually receive information via electrochemical signals from the axon of another neuron, but they can also send out certain types of signals.Neurotransmitters:Acetylcholine, serotonin, dopamine,. norepinephrine, and epinephrine are just some on the neurotransmitters that contribute to nerve impulses. Transmission of nerve impulses are accomplished when a nerve impulse causes the rupture of vesicles containing the chemical transmitter from the nerve ending. The neurotransmitter crosses the synapse and interacts with receptors located on the membrane of the next neuron. This interaction may produce membrane permeability changes which result in an excitatory response. After each impulse it is necessary to inactivate the neurotransmitter's action.

The Nervous System has a basic structure of the central nervous system & peripheral nervous system. The central nervous system has the brain which is divided in three segments: the forebrain, the midbrain & the hind brain. The central nervous system also has the spinal cord where the association neuron is found. The Peripheral nervous system is divided into two different groups of neurons: the sensory & motor. The nervous system is the main controlling and communicating system of the body. There are three overlapping functions of the nervous system. The first function is the gathering of information from the sensory receptors that monitor changes occurring internally and externally of the body. These receptors relay information called sensory input to the nervous system. The second function of the nervous system is the integration of this information. The sensory input is processed and the nervous system decides on how to respond every bit of information it receives. The third function of the nervous system is the actual response, called motor output, which is made from the acquired sensory input. The response usually activates the muscles and glands in the body.

The central nervous system is one of the most important organs of the nervous system. It is made up of two of the most vital organs in the human body, the brain and the spinal cord. Central nervous system functions include coordinating the activities between the various parts of the human body. Working in collaboration with the peripheral nervous system, central nervous system plays a fundamental role in controlling the behavior in various multicellular organisms. The Peripheral Nervous System consists of all the sensory nerves that feed information into the spinal cord and brain, and the motor nerves,they carry messages to other parts of the body from the brain and spinal cord. Sensory nerves contain sensory neurones. Motor nerves contain motor neurones. Mixed nerves contain both sensory and motor neurones. Sensory neurones are usually connected to motor neurones by intermediate neurones.There are two major components of the autonomic nervous system, the sympathetic and the parasympathetic systems. The afferent nerves subserving both systems convey impulses from sensory organs, muscles, the circulatory system and all the organs of the body to the controlling centers in the medulla, pons and hypothalamus.

The Nervous System


3 Kinds Of Systems..!



The frontal lobe is located at the front of the brain and is associated with reasoning, motor skills, higher level cognition, and expressive language. The parietal lobe is located in the middle section of the brain and is associated with processing tactile sensory information such as pressure, touch, and pain. The temporal lobe is located on the bottom section of the brain. This lobe is also the location of the primary auditory cortex, which is important for interpreting sounds and the language we hear. The occipital lobe is located at the back portion of the brain and is associated with interpreting visual stimuli and information. The primary visual cortex, which receives and interprets information from the retinas of the eyes, is located in the occipital lobe.Meninges:The meninges consist of three layers of connective tissue which enclose the brain. The dura mater is the outermost layer. It is immediately adjacent to the calvarium and is made up of thick fibrous connective tissue. The arachnoid mater has two components: a continuous membrane adherent to the inner surface of the dura and trabeculae which bridge through the subarachnoid space to attach to the pia mater. The arachnoid membrane runs over the surface of the brain but does not enter the sulci. The subarachnoid space contains blood vessels and the fibrous trabeculae of the arachnoid. The cerebral spinal fluid runs within this space. The pia mater is a thin membrane that is adherent directly to the surface of the brain. It does run down into the sulci and around blood vessels entering the brain. The main function of these meninges is to protect the central nervous system.


The five main senses are hearing, touching, tasting, seeing, and smelling.Each of the 5 senses consists of organs with specialized cellular structures that have receptors for specific stimuli. These cells have links to the nervous system and thus to the brain. Some disorders are: You may lose your sense of taste if the facial nerve is damaged, which is a symptom of anosmia (loss of smell), color blindness and night blindness which is usually generic or is caused by damage of the brain or optic nerve, Deafness is a disorder of the ear which is a hearing loss, some deafness cannot be medically fixed.Nervous system Disorders:Stroke: They occur when the arteries to your brain are narrowed or blocked, causing severely reduced blood flow.Lack of blood flow deprives your brain cells of oxygen and nutrients, and cells may begin to die within minutes. Cerebral Palsy: Cerebral palsy is a term used to describe a group of chronic conditions affecting body movements and muscle coordination. It is caused by damage to one or more specific areas of the brain, usually occurring during fetal development or infancy.Autism: Autism spectrum disorder and autism are both general terms for a group of complex disorders of brain development. These disorders are characterized, in varying degrees, by difficulties in social interaction, verbal and nonverbal communication and repetitive behaviors. The roots of this disorder starts in the early develpment of the brain.

Disorders & Diseases of senses & Nervous System!



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